so im in the market for a new lens. My camera is a Nikon FM2n, which means im looking at used manual focus lenses on E-bay. my question is, of the following lenses, which performs the best. IE sharpest, least ammount of distortion, etc etc. Im looking at the 20mm F2.8 AIs the 24mm f2.8 AI-s and the 28mm f2.8 AIs im leaning toward the 20 or 24mm dont bother suggesting a wide angle zoom, i cant afford the one i want (17-35mm F2.8) and thats the quality of glass im looking for, so to get that quality in a price range i can afford, im looked at a used prime lens.